Pkunzip doesn't work with 64 bit versions of Windows. Is there any 'drop in' alternative? I tried a couple of command line unzip programs but the arguments were different format - also Pkware doesn't seem to offer their command line prog for download any more.

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Had tried all these, just dropping them in without changing the command/argument format, obviously they didn't work. I just remember ages ago that some unzip programs used to use the same format. Was just being lazy!

Anyway, further investigation seems to show that the command line unrar program won't decompress zip files only rar files, at least that's what it tells me.

Also, for anyone who's interested the code for 7za and unzip are as follows: